Hi @mdarragh,
Welcome to the Bunnings Workshop community, it is fantastic to have you with us.
Unfortunately, as these gauges are designed for use with 4.5kg and 9kg gas bottles, which you'd generally use with a BBQ, you'd have to confirm suitability with your gas provider.
The bottles they provide might use a different fitting or operate at a higher pressure than those used for BBQs, so it would be better to be safe than sorry.
Sorry I can't be more help.
Jacob
